I have been having fun with redis (and then add fun by using it) throughout the final fews days and Let me determine if there's a method to empty the db (take away the sets, the present key....) easily.
Throughout my tests, I produced several sets with many different people, even produced sets that I don't recall the title (how do i list individuals men though ?).
Any idea concerning how to eliminate these ?

You should use either FLUSHDB or FLUSHALL command.

Be cautious here.

FlushDB removes all secrets in the present database while FlushALL removes all secrets in most databases around the current host.